Whether Ian Somerhalder's reciting vows in Atlanta for his assistant, or Emma Stone is presiding over her publicist's wedded bliss in Ojai—it's simply unforgettable when a celeb makes your union official!

CLICK HERE to see the gallery, "Celebrities Who've Officiated Weddings!"

CLICK HERE to see the gallery, "Celebrities Who've Officiated Weddings!"

CLICK HERE to see the gallery, "Celebrities Who've Officiated Weddings!"

CLICK HERE to see the gallery, "Celebrities Who've Officiated Weddings!"

CLICK HERE to see the gallery, "Celebrities Who've Officiated Weddings!"

Zayn previewed the duet by posting a black and white pic of himself with Swifty on his Instagram -- but hey, she is bestiez with his girlfriend Gigi Hadid, so it wouldn't be unusual that they hang out... But collab?!